Automatic radio control



19, 1959 9 Shets-Sheefi 1 C. J. CHALUPOWSKI AUTOMATIC RADIO CONTROLFiled Dec.

Feb. 10,1942.

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AUTOMATIC RADIO CONTROL Filed Dec. 19, 1939 9 Sheets-Sheet 7 Feb. 10,1942.

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I Patented Feb. 10, 1942 UNITED STATES PATENT- OFFICE AUTOMATIC RADIOCONTROL Chester J. Chalupowski, Salem, Mass.

Application December 19, 1939, Serial No. 310,004

Claims.

This invention relates to apparatus for automatically operating radioreceivers in accordance with a preselected program schedule.

Most people have a preferred selection of radio programs which they liketo hear. Such a selection may, for instance, consist of one or moredaily broadcasts, one or more weekly broadcasts, a one-time broadcast ofparticular interest which is usually announced several days ahead ofbroadcast time, etc. To miss none of the preselected broadcasts requiresperhaps more perseverance than most people care to exercise,particularly if the selection covers several days or even weeks. one ormore programs are missed simply because the selector forgot to tune inthese programs at broadcast time. To aid radio listeners in theexecution of their preselections, various apparatus have been devisedwhich automatically tune in the station or stations at the exact timewhen the selected programs are broadcast. Most of these apparatus coveronly one day's schedule, however, and hardly serve as a reminder to tunein recurring weekly broadcasts or a future onetime broadcast, which aremore liable to be missed than a broadcast in a single day's schedule. Ithas also been proposed to automatically tune in the selections forseveral days or perhaps a week by controlling an automatic tuning deviceby means of a plurality of daily recording plates or records which areautomatically changed every day in a predetermined sequence, and each ofwhich is preadjustable to effect tuning of a preselected programschedule for a single'day. While this accomplishes the automaticrecording of programs for as many days as there are records, i. e.,until the latter have performed once in their proper sequence, repeatedmanual rearrangements of these records for repeat performances in theproper sequence, as for recording recurrent weekly broadcasts, forinstance, are required.

It is the primary aim and object of the present invention to provide anapparatus which, after initial adjustment to a selected radio schedulefor a whole week, will automatically and without further adjustment ormanipulation, except turning on the radio receiver and setting the samefor automatic reception, render the selected broadcasts for anindefinite length of time, i. e., until the apparatus is adjusted to adifferent broadcast or broadcasts.

Before explaining in detail the present invention it is to be understoodthat the invention is Thus, it happens frequently that I not limited inits application to the details of construction and arrangement of partsillustrated in the accompanying drawings, since the invention is capableof other embodiments and of being practiced or carried out in variousways. Also it is to be understood that the phraseology or terminologyemployed herein is for the purpose of description and not of limitation,and it is not intended to limit the invention claimed herein beyond therequirements of the prior art.

In the drawings:

Fig. 1 is an elevatlonal view, partly in section,

of an automatic radio control which embodies the present invention.

Fig. 2 is .a fragmentary view of the periphery of a control drum whichis part of the automatic control.

Fig. 3 is a plan view of a certain element in the drum.

Fig. 4 is a fragmentary section, taken substantially on the line 4-4 ofFig. 2.

Fig. 5 is an elevational view of certain operating structure whichcooperates with certain elements in the drum.

Figs. 6 and '7 are enlarged front and side elevational views,respectively, of a certain element in the drum.

Fig. 7a is a plan view of the element shown in Figs. 6 and 7.

Fig. 8 is an end elevation of the structure shown in Fig. 5 as viewed inthe direction of arrow 8.

Figs. 9 and 10 are detail views of the opposite side walls of the drum.

Fig. 11 is an enlarged, fragmentary view of part of the apparatus shownin Fig. 1,

Fig. 12 is a fragmentary section, taken substantially on the line l2-|2of Fig. 11.

Fig. 13 is a fragmentary section, taken substantially on the line I3-l3of Fig. 11.

Fig. 14 is a fragmentary section, taken substantially on the line I4--l4of Fig. 11.

Fig. 15 is an enlarged, fragmentary elevational view of part of theautomatic control as viewed in'the direction of arrow 15 in Fig. 1.

,Fig. 16 is a perspective view of a certain manually operable element ofthe automatic control.

Figs. 1'1, 18 and 19 show the element of Fig.

16 in its different positions of operation.

Fig. 21 is a fragmentary side elevation, partly in section, of thecooperating elements shown in Fig. 20.

Figs. 22 and 23 illustrate two different switch boards 01' the automaticcontrol.

Figs. 24, 25 and 25a are sections, taken on the lines 26-24 of Fig. 22,26-25 and Ha-25a of Fig. 23, respectively.

Fig. 26 is a perspective view of a certain device of the automaticcontrol.

Figs. 27 and 28 are sections through the device or Fig. 26, the sectionsbeing taken substantially on the lines 21-21 and 26-28, respectively, ofFig. 1.

Fig. 29 is an enlarged section through the device shown in Fig. 26, thesection being taken substantially on the line' 29-28 of Fig. 1.

Fig.'30 is another enlarged section through the device shown in Fig. 26,the section being taken substantially on the line 36-30 of Fig. 1.

Fig. 31 is a side elevation of an element shown in Fig. 30. I

Fig. 32 is a fragmentary section onthe line 22-22 of Fig. 29, showing aswitch and a therewith cooperating element, the latter being also shownin fragmentary section.

Fig. 320 is a fragmentary section similar to Fig. 32, but taken on theline 32l1-32G of Fig. 29.

Figs. 33, 34 and 35 are elevational views, partly in section. of certainelements in the device shown in Fig. 26.

Fig. 36 illustrates a certain element of the automatic control.

Fig. 37 is a wiring diagram showing the various electrical circuits ofthe automatic controland their connections.

Referringto the drawings and more particularly to Fig. 1 thereof, thereis shown a preferred embodiment of a radio control which is adaptedautomatically to tune in certain pre-selected programs by turning, atbroadcast time, the shaft 50 of a gang condenser in a radio receiver(neither shown) as is customary in tuning radio receivers. In thepresent instance, programs from eight different stations may be selectedas indicated by the eight station disks la-h on the condenser shaft 50.For a clearer understanding of the present automatic control, the sameis preferably divided into the following sections for the purpose ofdescription:

Control drum A (Fig. 1)

Day drum index mechanism B (Fig. 1)

Quarter hour drum index mechanism C (Figs. 1 and 26);

Main control disk D (Fig. l);

Tuning device E (Fig. 1); and

Circuit controllers F (Fig. 1).

Control drum A Referring to Fig. 1, the automatic radio controlcomprises a main frame which may be constructed in any suitable mannerand is preferably mounted in the cabinet of a radio receiver so as to behidden from view. Journalled in suitable bearings, provided by spaced,depending arms 66 and 51 of the frame 55 is a shaft 56 which is heldagainst axial movement by means of collars 69 which abut the frame arms56 and 51. Mounted on the shaft 56, as by a set screw 60, is a hub 6|which is provided at one end with a plurality of radial arms 62 to whichis secured in any suitable manner a ring-shaped disk 63 concentricallyto the shaft 66. Secured in any suitable manner to this disk 63 is theinturned flange 66 at one side of a cylindrical mantle 65 (Fig. 4) whichforms the periphery of the control drum. Suitably secured to the otherside of the cylindrical mantle 66 in the manner shown in Fig. 4, for

instance, is another ring-shaped disk 66. It will now be understood thatthe hub 6! with its spokes 62 sustains the control drum, i. e., theringshaped disks 63 and 66 and the cylindrical mantle 65.

The entire drum periphery 65 is provided with a plurality of orderlydisposed slots 61, having depending punched-out tongues 68 (Fig. 7)which serve as guides for the gilas 69a of fillers 69 for movement ofthe latter radially of the drum. These fillers have reduced inner ends10 which are guided also for movement radially of the drum-incorrespondingly shaped slots 1| in an inner cylindrical mantle 12 of thedrum which is concentric to the outer drum periphery 65. Each filler 69may be brought into either one of two positions, i. e., the position 69ain Fig. 4 in which the corresponding slot 61a is exposed, and theposition 69b in which the projecting flanges 12a of the fillers (Figs. 6and 7) are flush with the drum periphery 65 and completely close theirrespective slots when viewed from the outside. As shown in Figs. 1, 2and 4, there are eight slots 61 in each of a numberfof axial rows, eachslot in an axial row representing a different selective broadcaststation. The slots 61 are also disposed in eight peripheral rows, eachslot in a peripheral row representing a selective quarter hour broadcastperiod of a selectivestation. Any one of the fillers 68 in an axial rowof slots 61 may be preset, i. e., depressed into the position 69a inFig. 4 in order to expose its respective slot 61 and thereby conditionthe drum for a broadcast on a certain day of the week for a certainquarter-hour period. To this end, each filler 69 is provided with twonotches 15 and 16 which are separated by a tooth 11 (Figs. 4 and 6).Guided for longitudinal movement in ways 18 and 19, provided in annularrings and 8|, respectively, on the drum disks 63 and 66, respectively,are a plurality of bars 82 of which each one is adapted to cooperatewith the fillers 69 in an axial row of slots 61.

As best shown in Fig. 3, each bar is provided with longitudinally spacedslots 83 which correspond in number to that of the fillers in each axialrow of slots 61. If a bar 82 is moved to the left as viewed in Fig. 4into the position shown therein, the .marginal end portions 64 thereofenter whichever notches 15 or 16 of the fillers 69 happen to be inalinement with said bar and thus lock the fillers 69 in either one ofthe positions 69a or 69?) shown in Fig. 4. Conversely, on moving the bar82 to the right as viewed in Fig. 4 until the bar slots 84 clear thenotches 15 or 16 of the fillers 69, the latter are free to be moved intoeither one of the positions 69a or 691; in Fig. 4, as will be readilyunderstood.

As each one of the slots 61 in an axial row represents a differentstation but the same quarter-hour broadcast time on the same day, itstands to reason that only one of the slots in an axial row is exposedas indicated at 61a in Fig. 4, for instance. The remaining slots 61 inthe same axial row are covered by the fillers in the positions 691),thereby preventing the automatic tuning of another, non-selected programfrom another station.

The drum is usually preset or conditioned for rendition of preselectedradio programs at broadcast time which mayjbe several days or a weekhence. As the present automatic contnol is designed to cover broadcasttime for each day of the week, the peripheral rows of slots 61 on thedrum are divided into sections of which each section is assigned for adifferent day of the week. Moreover, since the broadcast time for eachday has to be at least several hours to allow a wide selection ofprograms, and inasmuch as some programs last 15 minutes and otherprograms last a whole hour, for instance, each daily section provides ineach peripheral row sufficient quarterhour slots 61 to cover therequisite number of hours broadcast time each day. Thus, where it isdesired to condition the drum for a half-hour broadcast from a certainstation at a certain time within the time range of the control and on acertain day, two consecutive slots commensurate with said time andwithin the ppoper day section of slots as well as in the properstationidentifying peripheral row of slots, are exposed. If a selectedprogram from a certain station lasts an hour, it stands to reason thatfour consecutive slotsv 61 commensurate with the broadcast time and inthe proper peripheral station row and proper day section must beexposed, so that the radio receiver will be automatically tuned to saidstation at the proper time and for a period corresponding to the numberof exposed consecutive quarter-hour slots, which is four in the presentinstance and. covers one hour. If the pre-selection calls, for instance,for a quarter hour program of one station to be followed immediately bya half hour program of another station, the proper exposed slot in theproper peripheral station row for the quarter hour pnogram is im-"rnediately followed peripherally of the drum by two consecutive,exposed slots in another peripheral station row commensurate with said Iother station, as will be readily understood.

secutive programs from any of the selector stations may be automaticallytuned in. As the present automatic control covers five hours each dayand four consecutive slots 61 in a peripheral row correspond to onehour's broadcast time, it is evident that each daily section mustconsist of twenty axial rows of slots 61 so as to cover a time period oftimes 4 one-quarter hour periods, 1. e. five hours,

As best shown in Figs. 11 and 12, eight arresters 90, one for eachselectable broadcast station, are pivoted on a shaft 9I which issuitably mounted in the frame 55. Each of these arresters 90 isprevented in any suitable manner from sliding axially on the shaft BIand is provided witha finger 92 in alignment with a peripheral stationrow of slots 61 (Fig. 11). The arresters 90 are normally urged intoengagement with the pesprings 93. It may be stated in advance that abroadcast for which the drum is conditioned will be automatically tunedin when the finger 92 of the arrester for the proper station drops intothe exposed slot 61 which is identified with said broadcast.

As already mentioned, the drum is conditioned for selective broadcastsby exposing the corresponding slots 61 on presetting or depressing (Fig.5) are provided which engage the lower ends of the fillers 69 when thelatter are in alignment with the fingers 92 of the arresters 90 as shownin Fig, 12. Hence, it is in this angular position of the slots 61 andfillers 69 that the drum is conditioned for selected programs, and itmay be stated in advance that the points 92 of the arresters 90 are usedto depress the fillers in the selected slots. The plungers 84 arecarried by a bracket 85 which is mounted in any suitable manner on theframe 56 as at 96. The upper ends of the plungers 94 have inclinedportions 91 (Fig. 8) against which the fillers 69 brush and slightlydepress these plungers when the drum is indexed and while the same is atrest, respectively. Thus, on moving the bar 82 for the axial row ofslots, which'is presently in alignment with the fingers 92 of thearresters 90, inwardly with respect to the drum, the thereupon unlockedfillers 59 are prevented from gravitating into the depressed position69a (Fig. 4) by the springurged plungers 94 and only that filler 69 willbe depressed which is intended to be depressed by an arrester 90.

As best shown in Figs. 1 and 10, the side disk 86 of the control drum isprovided with seven equi-angularly spaced pins I00, each beingidentifled with a certain day in the week. These pins I00 are adapted tobe engaged by the day drumindex mechanism B and are spaced apart anangular distance which equals that of a day section of slots 61 on thedrum. Thus, if the automatic control has not been used for several daysand automatic control is then desired, the drum will be indexed throughthe medium of a sufficient number of consecutive pins I00 in order tobring the proper day section of slots 61 into operation position for theday on which the automatic control is turned on.

In order to index the drum through an angular distance equivalent tothat between two consecutive slots 57 in a peripheral row, the drumperiphery 65 is also provided with correspondingly spaced ratchet teethIOI (see also Fig. 26) with which is adapted to cooperate a pawl I02 ofthe quarter-hour drum-index mechanism C to be described hereinafter.

The same side disk 56 of the drum is also provided with 7 equi-angularlyspaced rows of uniformly staggered hour tracks I05, the equiangularlyspaced tracks in each row representing the five hours broadcast time ona certain day of the week. Within theanguiar region of each hour trackI05 and nearer the periphery ofthe drum are four equi-angularly spacedand uniformly staggered pins I08 which represent the four quarter-hourintervals of each broadcast hour.

The other side disk 63 of the drum (Fig. 9) is provided with sevenequi-angularly spaced and uniformly staggered tracks I01 which represent.the '7 days of the week. A comparison between Figs. 9 and 10 indicatesthat the angular extent of each day track I0! is equal to the angularextent of the five hour tracks I05 for one day and the angular distancebetween two consecutive index pins I00. The various tracks I05 and I01and the pins I06 on the two side disks of the drum are adapted todepress certain switches, to be described later, in order to controlcertain electrical circuits which are part of the day and quarter-hourdrum index mechanisms B and C.

Pivoted on a shaft Illl, which is suitably mounted in the frame 55, areeight tuning elements III, one for each selective broadcast station.These elements III are in alignment with the corresponding station disks5Ia-h as best shown in Figs. 11 and 12, and each of these elements IEIIhas a tongue H2 (Fig. 13) which engages a corresponding tongue H3 of itsrespective arrester 90. Hence, when the finger 82 of an arrester 90drops into an exposed slot 61 in the drum periphery, the engagingtongues H3 and H2 of said arrester and of the corresponding tuningelement III, respectively, cause the latter to rock counter-clockwise asviewed in Fig. 12, whereby a finger H4 of the tuning element comes tobear against the periphery of the corresponding station disk 5Iah. Thetuning elements II I are made of slightly resilient material and theirfingers II4 are so closely spaced from the peripheries of the stationdisks 5Iah that they are not only moved with their fingers II4 intoengagement with said peripheries but are also tensioned when theirrespective arresters 90 drop with their fingers 92 into aligned slots 61in the drum periphery. After the tuning device E has turned the stationdisks 5Ia--h suiiiciently to bring a notch H5 in the periphery of one ofthese disks into alignment with the finger II4 of a tensioned tuningelement III, said finger snaps into said notch H5 and prevents furtherrotation of the station disks. It may be stated in advance that thetuning device E, which causes rotation of the gang condenser shaft 50and, therefore, of the station disks 5Iah, is disconnected from itspower source and rendered inoperative when the finger II4 of a tuningelement III enters the peripheral notch H5 of a station disk. Theangular disposition of the peripheral notch H5 in each station disk issuch that the station represented by the disk is sharply tuned when its.

notch H5 is locked with the finger II4 of the corresponding tuningelement III.

Day drum index mechanism B Referring to Figs. 1, 26, 28, the frame 55 isprovided. with a cage I20 in a rib I2I of which (Fig. 28) is suitablymounted a stub shaft I22 on which a gear disk I23 is freely rotatableand held against axial movement thereon in any suitable manner. The geardisk I23 carries an eccentric pin I24, received in an elongated slot I25of a double arm lever I26 which is freely rotatably mounted on the drumshaft 58 and held against axial movement thereon in any suitable manner.The stub shaft I22 terminates at the front face I23a (Fig. 28) of thegear disk I23 in order not to interfere with the rocking motion of thelever I26 as caused by its connection with the eccentric pin I24 on therotary gear disk I23. Pivotally mounted at I21 (Fig. 1) on the lower endof the lever I26 is a pawl I28 having a finger I29 which is adapted tocooperate with the day index pins I00 (Fig. on the side disk 66 of thecontrol drum. The pawl I28 is normally rocked clockwise as viewed inFig. 1, i. e., out of cooperative relationship with the day index pinsI00, by means of a tension spring I30. An electro-magnet I3I is alsosecured to the lower end of the lever I26. The core I32 of thiselectromagnet will, on energization of the latter, rock the pawl I28into cooperative relationship with the pins I00. The gear disk I23 is inpermanent mesh with a gear I33 (Figs. 26 and 33) on a shaft I34 which issuitably journalled in the cage I20 and carries at one end a gear I35which meshes with a pinion I38 (Fig. 1) on the shaft I31 of anysuitable, small electric motor I38 which is suitably mounted on the cageI20. Thus, when this motor runs, the pawl-carrying lever I26 will beoscillated through intermediation of gears I38, I35, shaft I34, gearI33, gear disk I23, eccentric pin I24 and elongated slot I25 in saidlever I28. Moreover, if the electro-magnet I3I is then energized, thepawl I28 is rocked into coopera-, tive relationship with the day indexpins I00 and indexes the control drum.

Quarter hour index mechanism C The previously mentioned quarter-hourindex pawl I02, which cooperates with the ratchet teeth MI in the drumperiphery, is pivotally carried atI40 (Fig. 26) on an arcuate extensionI4I of a lever I42 which is freely rotatable on a stub shaft I 43,suitably mounted in a rib I44 of the cage I20. The lever I42 is providedwith an elongated slot I45 in which is received an eccentric pin I48 ona disk I41 at one end of the shaft I34 (see also Fig. 33). The pawl I02has a laterally extending pin I48 which rests on one arm I40 of a bellcrank lever I50 (Fig. 27) which is pivotally mounted at I5I in the cageI20 and normally rocked clockwise as viewed in Fig. 27 by a suitablymounted tension spring I52. Suitably mounted on the cage I20 is anotherelectromagnet I53. On energization of the electromagnet I53, its coreI54 attracts the bell crank lever I50, thereby rocking the samesufficiently counterclockwise as viewed in Fig. 2'] to permit the pawlI02 to drop into cooperative engagement with the ratchet teeth IOI inthe drum periphery. It will now be understood that if the motor I38(Fig. 1) runs and the electro-magnet I53 (Figs. 26 and 27) is energizedthe control drum will be indexed through intermediation of gears I36 andI35, shaft I34, disk I41 (Fig. 26), eccentric pin I46 thereon, lever I42with its arcuate extension I4I, pawl I02 and the ratchet teeth IOI inthe drum periphery. It appears from Fig. 26 that the pawl I02 is soconstructed as to index the drum in the direction of the arrow I55 only,and will ride idly over said ratchet teeth when moving in the oppositedirection. The eccentric stroke of the pin I46 on the disk I41 is equalto the distance between two consecutive ratchet teeth IOI on the drumperiphery. Hence, the

. control drum is indexed by the pawl I02 in intermittent steps whichare equal to the distance between two consecutive slots 61 in aperipheral row.

Main control disk D Referring now to Figs. 1, 11 and 16 to 21,inelusive, the frame 55 is provided in any suitable manner with a secondcage I60 wherein is rotatably but axially immovably mounted a stub IGI,carrying a main control disk I62. That end of the stub I6I whichprojects outwardly beyond the cage I60 preferably extends through thefront panel of the radio cabinet and has a knob thereon (neither shown)for manipulation of the control disk I62 from said front panel. Thecontrol disk I62 performs a different function in each of threepreassigned angular positions into which the same may be manipulated. Asbest shown in Fig. 16, the disk I62 has on one face I63 and at theperiphery thereof a cam track which consists of a slope I64 and auniform crest I65. The slope I64 and crest I65 extend each over leavinga 120 gap between the beginning and end of the cam track. On itsopposite face I68, the control disk I83 has the same cam track repeated,the same comprising a. slope I61 and a uniform crest I88. The two camtracks on the opposite faces of the control disk I62 are so disposedthat their combined width W (Fig. 21) is uniform throughout. Hence, thecam slope I61 on the disk face I66 ascends from the latter at I69 (Fig.16) at a place which is in axial alignment with the highest point I ofthe slope I64 on the opposite disk face I63, the cam crest I65 on thedisk face I63 occupies the angular region of the gap between theopposite ends of the cam track on the disk face I66 and, conversely, thecam crest I68 on the disk face I66 occupies the angular region of thegap between the ends of the cam track on the disk face I63, all as shownin Fig. 16. The periphery'of the control disk I62 is also provided witha cam lobe I1I'which is adapted to close a switch I12 when the controldisk assumes the angular position shown in Fig. 17, i. e., the on"position in which the automatic control is rendered operative by virtueof the closing of the switch I12. In this angular position of thecontrol disk I62, a rocker I13, which straddles the cam tracks of thecontrol disk in the manner indicated in Figs. 20 and 21 and is pivotallymounted at I14 on the cag I60, assumes the dotted line position I13a inFig. 21, because said rocker then cooperates with .the cam crest I65 onthe face I63 of the control disk, as will be readily understood. Therocker I13 is provided with a notch I in which the depending flanges I16of the filler-locking bars 92 in the control drum are adapted to bereceived in the manner shown in Fig. 21. The notch I15 is just longenough to receive one of these flanges I16 at a time. In the on positionof the control disk I62 as shown in Fig. 17, the rocker I16 is, asalreadymentioned, in the dotted line position 113a in Fig. 21 in whichits notch I15 assumes the dotted line position 115a, i. e., is inalignment with the flanges E16 of the bars 82 when the same assume thefiller-locking position 116a shown in Figs. 4 and 21. In the angularposition of the control disk I62 shown in Fig. 18. the same is in the"off" position in which the switch-actuating cam lobe I11 is 120 removedfrom the switch I12, permitting the latter to assume its normal, openposition and thereby disconnect the entire automatic control from itspower source, and, hence, render it inoperative. During clockwiserotation of the control disk I62 from the on position in Fig. 17 intothe "off" position in Fig. 18, the rocker I19 cooperates with the camcrest I of said control disk, with the result that said rocker remainsin the dotted-line position I13a (Fig. 21). Thus, the notch I15 of therocker I13 remains in alignment with the flanges I16 of the bars 62intheir filler-locking position when the control disk I62 is turned fromthe on position- (Fig. 17) clockwise into the off position (Fig. 18), orwhen the same is turned from the off position counter-clockwise asviewed in Fig. 18 into the on position. In the off position of thecontrol disk I62 (Fig. 18), its cam lobe I1I holds a depressor frame I18depressed in the manner shown in Fig. 12. This frame I18 comprises twospaced, parallel bars I19 (Fig. 14) which are pivotally mounted with oneend at I on the frame 55 and connected at their other ends by a crossbar I8I which overlies the tuning elements III in the manner best shownin Figs. 11 and 12, and 14. A spring I8Ia normally urges the depressorframe with its follower I18a toward the control disk I 62. Thus, whenthe control disk I 62 is rotated into the off position, the depressorframe I18 is rocked clockwise as viewed in Fig. 12, whereby the crossthe frame 55.

bar I6I thereof lowers whichever tuning element III happens to be inlocking engagement with the corresponding station disk 5Iah and therebyreleases the condenser shaft for manual control.

On turning the control disk I62 into the selector position shown inFigs. 19, 20 and 21, the rocker I18 cooperates with the cam crest I68 onthe face I66 of said control disk, meaning that the rocker I13 is thenin the full line position shown in Fig. 21 in which the bar 82, whoseflange I16 is presently straddled by the rocker, is in itsfiller-releasing position and permits exposure of a selected slot 61. inthe drum periphery in the earlier explained manner. The control disk I62can be turned into the selector" position only in counter-clockwisedirection as viewed in Figs. 18 and 1'? from either the off or the onposition during which rotation the descending cam slope I64 on the diskface I63 and the opposite, ascending cam slope I61 on the disk face I66cooperate to swing the rocker 116 from the dottedline position I16a intothe full-line position shown in Fig. 21. Clockwise rotation of thecontrol disk I62 into the selector position (Fig. 20) is prevented bythe adjacent ends I and I86 (Fig. 16) of the cam crests I65 and I66which do not permit a cross-over of the rocker I13 from cooperativeengagement with the one cam crest into cooperating engagement with theother cam crest, and vice versa. Hence, the operation of the controldisk I 62 is restricted to counter-clockwise rotation from the foffposition (Fig. 18) over the on' position (Fig. 1'7) to the selector"position (Fig. 19) and clockwise rotation from the selector positionover the on position into the off position.

Tuning device E Referring to Figs. 1 and 27, the shaft 50 of the gangcondenser carries a disk I90 which is in frictional engagement with agrooved disk I9I, rotatably mounted on a short stub I92 on Alsofrictionally drivingly engaging the grooved disk 19f is a segment I96 onone end of an arm I94, the other end of which is rotatably mounted onthe drum shaft 56 and prevented from axial movement thereon in anysuitable manner. The arm I94 is provided with an elongated slot I95,receiving an eccentric pin 196 on a gear disk I91 which is rotatably butaxially immovably mounted on the previously mentioned stub shaft I43.This stub shaft 149 terminates at the front face I98 of the. gear diskI91 so as not to interfere with the rocking motion of the arm I94 ascaused by its engagement with the eccentric pin I96 of the rotary geardisk I96. The periphery I99 of the segment I93 is concentric to the axisof the drum shaft 58 and is of such length that that the same will,during its rocking motion in either direction. cause rotation of thecondenser shaft 50 through an angular range commensurate with themaximum band spread required for tuning the eight selector stations. Thegear disk I91 is driven by a pinion 200, provided by a friction-clutchmember 201 (Fig. 34) which is rotatably mounted on the shaft I 34 (seealso Fig. 33) and whose frusto-conical surface 202 is held in frictionalengagement with a corresponding frusto-conical surface 203 on said shaftI34 by means of a spring 204, one end of which bears against the bottom205 of an annular recess 206 in said clutch member 20I. and the otherend of which bears against the adjacent wall portion 201 (Fig.

26) of the cage I20. Mounted on a cross-shaft 208 in the cage I20 (Fig.27) is a small gear 208a which is in permanent mesh with the gear diskI91 and provided with a plurality of stop pins 203!) that are adapted tobe engaged by a finger 203 on a lever 2I0 which is pivotally mounted at2 in the cage I20. A tension spring 2I2 normally holds the lever 2I0 andits finger 203 in operative relationship with the stop pins 20%. Mountedin any suitable manner on the cage I20 is an electro-magnet 2I3. Onenergization of this electro-magnet, its core 2 attracts the lever 2I0,thereby withdrawing the finger 203 from cooperative relationship withthestop pins 208 and thereby rendering the drive for the gear disk I31operative by permitting the clutch member 20! to be frictionally drivenby the cooperating clutch surface 203 on the shaft I34. It may be statedin advance that the electro-magnet 2I3 is energized while the gear diskHi1, and hence, the condenser shaft, are rotated, and saidelectro-magnet is deenergized immediately after the finger II4 of thetuning element III, which corresponds with the next selected station,drops into the notch II5 of its respective station disk 5Iah, (Figs. 11and 12) thereby causing immediate return .of the lever 2I0 and itsfinger 203 into operative alignment with the nearest stop pin 20%.Hence, after the finger I I4 of the tuning element I II has dropped intothe notch II5 of the station disk and thereby locked the latter againstfurther rotation, the friction drive from the shaft I34 to the clutchmember 20I continues only for a very short time, i. e., until the nextof the numerous stop pins 20% engages the finger 203 (Fig. 27), wherebythe ensuing lost motion between the locked station disk and clutchmember MI is taken up by slippage of the driving segment I93 on thegrooved disk IBI and/or slippage of the latter on the disk I90 on thecondenser shaft 50 (Fig. 27).

Circuit controllers F Before describing the various circuits of theautomatic control, reference is had to several circuit controllers F.Referring to Figs. 1 and 29 to 32a, inclusive, the first circuitcontroller to be described comprises a stationary switchboard 220 andarotary switch actuator 22I. More particularly, the switchboard 220 ispreferably in the form of a disk of insulating material which is mountedin any suitable manner in the cage I20 and carries three equi-angularlyspaced sets 222, 223 and 224 of switches. The set 222 comprises fiveswitches 225-229, respectively, the second set 223 comprises also fiveswitches 230 to 234, respectively, and the last set 224 comprises theswitches 235, 236, 231. All of these switches may be of the sameconstruction as the switch 225 shown in Fig. 32, and may be mounted onthe switchboard 220 in the same manner as said switch 225. The switch225.comprises two conductive blades 230 which are suitably mounted onthe rear face of the switchboard and project in a recess 23I of thelatter. The blades 230 carry contacts 232 which are normally disengagedand may be brought into engagement with each other by depressing thatswitch blade 230 which extends beyond the front face 233 of theswitchboard 220. Leads a: and may be connected in any suitable mannerwith the blades 230.

Adapted to cooperate with the switches on the board 220 is the switchactuator 22I which is rotatably mounted on the previously mentioned stubshalt I22 concentrically of said switchboard. and is provided with a.gear 235 which is in permanent mesh with a pinion 23$ (Figs. 26 and 30)of a friction "clutch member 231 (Fig. 35) which is rotatably mounted onthe shaft I34 (Figs. 26, 33 and 35) and normally urged with itsfrusto-conical surface 238 into frictional driving engagement with acorresponding frustoconical surface 233 01' the shaft I34 by means of acompression spring 240 (Fig. 26). One end of said spring 240 bearsagainst the clutch member 231 and the other end thereof bears againstthe wall portion 24I of the cage I20. The switch actuator 22I is alsoprovided with an annular cam track 242 of insulating material, being interrupted by a gap 243 and having a radial cam extension 244. Theswitches on the board 220 are so radially disposed with respect to thecam track 242 and its radial extension 244 that the track 242 closesonly'the switch 235 and the narrow neck 245 of the cam extension 244closes the outermost switches 225 and 230 of the switch sets 222 and223, respectively, and the middle switch 236 of the switch set 224.

The switch actuator 22I is, during each working cycle of the automaticcontrol, indexed three times by the above-described drive. Moreparticularly, in the home position of the switch actuator 22I the sameassumes an angular position in which the radial axis W---W of its camextension 244 is in alignment with the central axis X-X of the switchset 222 in the switchboard 220 (Fig. 29), thereby closing the switchesof said set. The first indexing step of the switch actuator 22I from itshome position in clockwise direction as viewed in Fig. 30, or incounterclockwise direction as viewed in Fig. 29, brings the axis W-W ofthe cam extension 244 into alignment with the central axis Y--Y of theswitch set 223, in which position said cam extension closes the switchesof said set. The following, second indexing step of the switch actuator22I in the same direction brings the-axis W--W of the cam extension 224into alignment with the central axis Z--Z of the switch set 224, inwhich position said cam extension closes the switches 236 and 231, theother switch 235 of said set having been held closed by the annular camtrack 242 since the start of the first indexing step of the switchactuator from its home position. The following, final indexing step ofthe switch actuator 22I, still in the same direction, returns the camextension 244 into its home position. Inasmuch asthe shaft I34 iscontinuously driven during an entire working cycle of the automaticcontrol, and as the switch actuator 22I has to be intermittently stoppedduring each working cycle in the above-mentioned positions sufllcientlylong to permit the performance of certain operations to be explainedhereinafter. means are provided to intermittently interrupt the drivebetween the power-driven shaft I34 and said switch actuator 22I. To thisend, the switch actuator -22I is provided with three equi-angularlyspaced pins 250 (Fig. 31) which are adapted to be engaged by a finger25I (Fig. 27) of a double arm lever 252 which is pivotally'mounted at253 in the cage I20 and normally urged into cooperative relationshipwith one of the pins 250 by means of a tension spring 254. Anelectro-magnet 258 is suitably mounted on the cage I20. On energizingthis electro-magnet, its core 251 attracts the lever 252, causing thefinger 25I thereof to clear whichever stop pin 250 of the switchactuator 22I is in engagement therewith and thereby releasing saidswitch actuator for the next indexing step. It may be stated in advancethat the electro-magnet 258 is energized only momentarily so that thefinger 25| of the lever 252 returns into the path of the next stop'pin250 on the switch caged stop pin 250 has cleared said finger. While theswitch actuator MI is thus intermittently stopped during a working cycleof the automatic control, the friction clutch element 23'! (Figs. 26 and35) is held non-rotatable and the therewith cooperating clutch surface239 on the shaft I34 (Fig. 33) slips on the corresponding clutch surface238 of'said clutch element 231.

Amongthe circuit controllers F are further switchboards 210 and 21!(Fig. 11) which are mounted on the frame 55 on opposite sides of thecontrol drum. The switchboard 210 comprises 7 day switches 2'l2a-g, onefor each day in the week. Each of these switches is adapted to be closedby a corresponding day track ill! on the side disk 53 of the controldrum (Figs. 1 and 9). The switchboard 27! comprises two sets of switchesIlia-e and file-d. The switches ii'lSa-e are hour switches and theswitches ZMa-d are quarter-hour switches. The hour switches 21311-6 areadapted to be closed by the corresponding hour tracks H on the otherside disk (56 of the drum (Figs. 1 and 10), and the quarter-hourswitches 2T4a.d are adapted to be closed by the correspondingquarter-hour pins lot on the same side disk 68 of the drum. Theswitchboards 210 and TH are also shown in plan view in Figs. 22 and 23,respectively, and in section in Figs. 24 and-25, 25a, respectively.Accordingly, the switchboard 21c comprises a base 2115 provided with arib 215a of any suitable insulating material in which the variousconductive blades of the switches 2lZa--g are mounted. Fig. 24 showsmore particularly the construction of any one of the switches 2l2a-gwhich com prises three pairs of contact blades 216a: and b. 2777a and b,and 218a and b. The blade 218a is provided with a follower 219 and adepending insulating spacer 280 that bears against the switch bladeElla. Between the front ends of the switch blades 2161) and 211a isanother insulating spacer 28f which keeps these blades apart at alltimes. When the switch is not acted upon by its respective day tracklull on the control drum, the contacts of the two pairs of blades Eliaand b and 218a and b are closed, whereas the contacts of the lowermostpair of blades 216a and b are disengaged from each other. If the controldrum isindexed in the direction of the arrow 282 in Fig. 24, the properday track l0! thereon will cooperate with the follower 219 and depressthe blades 213a, 211a and 216b, the latter two through intermediation ofthe spacers 230 and 28L This causes opening of the contacts of the twopairs of blades 211a and b and 218a and b and closing of the contacts ofthe lowermost pair of blades 218a and b, as will be provided with a rib28-6 of any suitable insulating material in which are suitably mountedthe various blades of the hourswitches 2'l3ae and of the quarter-hourswitches Mia-d. Each one of actuator immediately after the previouslyenthe hour switches 213ae is of the construction shown in Fig. andconsists of a pair of conductive blades 281a and b of which the blade2811; is provided with a follower 288, adapted to be engaged by itsrespective hour track ID! on the control drum. When the recording drumis indexed in the direction of the arrow 289 in Fig. 25, an hour trackI05 will engage the follower 288 of the blade 28') and depress the sameso that its contact will engage that of the other blade 281a, therebyclosing the switch.

The construction of each of the quarter hour switches 214a-dis.illustrated in Fig. 25a. Ac cordingly, each of the quarter hourswitches comprises two pairs of conductive blades 290a and b and 29m andb, which are suitably mounted in the rib 286 of the switchboard 2H. Theblade ram is provided with a follower 292, and an insulating spacer 293is provided between the blades 2911b and 28 la so that the same willnever contact each other and be depressed in unison with a quarter hourpin M6 on the control drum engages and depresses the follower 292 of theblade 28M, thereby opening the contacts of the blades 29 la and b andclosing the contacts of the blades 250a and b. This will happen when thecontrol drum is indexed in the direction of the arrow 294 in Fig. 25aand the proper quarter-hour pin I66 moves into cooperative engagementwith the follower 2&32 of the blad 29m. Hence, each of the quarter-hourswitches has the contacts of one pair of blades closed and those of theother pair of blades open when the switch is not engaged by aquarterhour pin I06, and vice versa when the switch is engaged by aquarter-hour pin I06.

Also included among the circuit controllers F is a manually operable dayselector switch 800 (Fig. 37) which is preferably mounted on the frontpanel of the radio receiver so as to be manipulatable from the outside.This switch may be of any suitable construction, details of which arenot shown as this is deemed unnecessary. As indicated in Fig. 37, theday selector switch consists of seven switch sections 30!, one for eachday in the week and each comprising three pairs 3&2, 303 and 304 ofnormally disengaged contacts. Preferably, the 7 sections of the switchare arranged circularly so as to be operable, one at a time, byamanually rotatable switch actuator (not shown). When the switch actuatoractuates a certain day switch section of the selector switch; only thetwo contact pairs 303 and 804 of said switch section and not the thirdcontact pair 302 thereof, and instead the contact pair 302 of thefollowing day switch section, are closed. Th s follows clearly from thepresently actuated Wednesday switch section, indicated W in Fig. 37, ofwhich the contact pairs 303 and 304 are shown closed, and from thefollowing Thursday section, indicated T, of which the contact pair 302is shown closed.

As shown in Fig. 37, a contact of the third pair 304 of each day sectionof the selector switch 300 is connected with a corresponding cont-act216a of the first pair 2160-?) of each day switch on the switch board210. The various pairs of contacts of the selector switch 300 and of theday switches on the switch board 216 are otherwise connected in circuitswhich will be fully described hereafter in connection with the wiringdiagrams in Fig. 37.

Further included among the circuit controllers F is a clock (not shown)which is preferably electric and has a conductive hour hand 3H) and aconductive minute hand 3!! (Fig. 37). The hour hand 3!!) wipes in thecourse of twelve hours over twelve conductive tracks 3I2 which arenarrowly spaced and insulated from each other so that said hour handmay, on leaving one track 3! 2, immediately move into contact with thenext track 3I2. The minute hand 3!! wipes in the course of each hourover four quarter hour conductive tracks 3I3 which are also narrowlyspaced and insulated from each other. An annular conductive track 3I4 isalso provided with which the minute hand 3! I is in permanent contact.

Mode of operation Supposing it is 8:01 p. m. on Wednesday and theautomatic control has been turned off on the same day between 6:30 p. m.and 6:45 p. m., and the drum is conditioned for a program for 8:00 p. m.Wednesday which is desired to be heard, the listener then turns thecontrol disc I62 into the "on" position shown in Fig. 17, therebyclosing the switch I12. Closing of the switch I12 (Fig. 37) results inthe closing of an energizing circuit for an electro-magnet 3I5. Thisenergizing circuit passes from one side of the input 3I3 and iscontinued through lead 3I1, closed switch I12, lead 3I8, the closed,first contact pair 302 of the Thursday section of the selector switch300, lead 3I9, the closed, third contact pair 213:: and b o! theThursday switch on the switchboard 210, leads 320 and 32!, the windingof the electro-magnet 3I5, leads 322 and 323, the normally closedcontact pair 29Ia and b of the first quarter-hour switch 214a on theswitchboard 21!, lead 324, switch 229 of the switch set 222 which isthen closed by the cam extension 244 of the switch actuator 22! in itshome position 244a shown in dash lines in Fig. 37, lead 325, the firstquarter hour track 3I3a of the clock, the minute hand 3!! which is thenin contact with said track, the annular track 3 I4 with which saidminute hand is also in contact, lead 326, switch 225 of the switch set222 which is then closed by the switch actuator 22! in its homeposition, leads 32'! and 328 and back to the other side of the input3I5. As soon as the electromagnet 3I5 is thus energized, its core 329attracts a contact blade 33!! and moves the latter into engagement withcontacts 33! and 332 against the tendency of a tension spring 334 tomove said blade 330 into engagement with a contact 333.

Engagement of the blade 330 with the contact 332 closes the circuit forthe electric motor I33 from the lead 320 which is connected with oneside 3I6a of the input 3I6 in the previously explained manner, throughleads 335, 336 and 331, contact 332 and engaged blade 330, and throughleads 330 and 339 to the other side of the input 3I6. Engagement of theblade 33!! with the contact 33! closes the energizing circuit for theelectro-magnet 250 (see also Fig. 27) which comprises the lead 320 andits previously mentioned connection with one side of the input, lead340, the winding of the electro-magnet 258, lead 34!, contact 33! andthe therewith engaged blade 330, and leads 333 and 339 which pass to theother side of the input.

Hence, when theoperator turns the control disc I62 on the outside of thereceiver to the on position shown in Fig. 17, the electro-rnagnet 3I5 isimmediately energized and attracts the contact blade 330, therebyclosing the motor circuit as well as the energizing circuit for theelectromagnet 253. On energization of the electro magnet 258, the lever252 (Fig. 27) is attracted and its finger 25! withdrawn from stoppingengagement with one of the pins 250 (Fig. 31) on the switch actuator22!, thus permitting the latter to be indexed from the home positioninto the first intermittent stop position in which its lateral camextension 244 assumes the dot and dash line position 244!) shown in Fig.37 and closes the switches or the switch set 223 (see also Fig. 29).During this first indexing step of the switch actuator 22! from homeposition, the lateral cam extension 244 thereof soon moves out ofswitchclosing engagement with the switch set 222', whereupon theswitches thereof return to their normal, open position and theenergizing circuit for the electro-magnet 3 5 is thereby openedconsiderably before the lateral cam extension 244 arrives in the dot anddash line position 2442) in Fig. 37. Hence, the contact blade 330 hasalready returned into engagement with the contact 333 when the switchactuator 22l arrives in its first intermittent stopping position. On theother hand, the circuit for the electric motor I38 remains closed fromthe time the switch actuator 22! starts from home position until itreturns into the home position again. This is accom plished by a holdingcircuit for the motor I38 which is closed in any position of the switchactuator 22! except its home position. To this end, the gap 243 in theannular track 242 of the switch actuator is so arranged that the samebridges the switch 235 of the switch set 224 in the manner shown in Fig.32a when the switch actuator is in its home position, while said annulartrack 242 keeps said switch 235 closed in any other angular position ofthe switch actuator. Closing of the switch 235 results in closing of theholding circuit of the motor which comprises the previously mentionedlead 320 with its connection with one side 3I6a of the input, leads 335and 336, the switch 235 which is then closed by the annular track 242 ofthe switch actuator, and lead 339 which passes to the other side of theinput.

Switch 230 of the set 223, which is closed by cam extension 244 of theswitch actuator in its first intermittent stopping position, keeps theenergizing circuit for the electro-magnet I53, which controls theoperation of the quarter-hour drum indexing mechanism, closed until thedrum is indexed in quarter-hour steps to such an extent that one of itshour tracks I05 and one of its quarter-hour pins I06 actuate that hourswitch and that quarter-hour switch, respectively, on the switchboard21! which is in electrical connection with the hour track 3! 2a andquarterhour track 3I3a, respectively, which are then contacted by thehour hand 3I0 and the minute hand 3! I, respectively. In other words,the drum is thus indexed in quarter-hour steps, until that axial row ofslots 51 which corresponds to the time indicated by the clock arrivesadjacent the fingers 92 of the arresters 90. In Fig. 37, the hour hand3I0 just engages the 8 oclock track 3I2a and the minute hand 3!! isshown in conductive engagement with the first quarterhour track 3I3a,thus indicating approximately 8:01 oclock.

The energizing circuit for the electro-magnet I53 comprises thepreviously mentioned lead 320 with its connection with one side 3I5a o!the input, lead 355, the winding of the electro-magnet I53, lead 356,contact 351, a yielding contact blade 358, lead 359, the then closedswitch 230. leads 360 and 36!, contact 333 and the contact blade 330engaged therewith, and leads 338 and 339 which pass to the other side ofthe input.

As soon as the control drum is indexed in quarter-hour steps to theexplained extent, the electro-magnet 3I5 is immediately reenergized in amanner to be explained presently. Inasmuch as the automatic control isturned on again at 8 p. m. or 8:01 p. m., i. e., at the time indicatedby the hour and minute hands of the clock in Fig. 37, the drum isindexed in quarter-hour sieps until an hour track I05 and a quarter-hourpin I06 on the drum close the 8 p. m. hour-switch 213d and the firstquarter-hour switch 214a, respectively, on the switchboard 2'. Whenthese switches are thus acted upon, the electro-magnet 3 I 5 isreenergiz'ed and the energizing circuit comprises lead 320 with itsconnection with one side 3I6a of the input. lead 32I, the winding of theelectro-magnet 3l5, leads 322 and 323, the then closed contact pair 290aand b of the first quarterhour switch 214a on the switchboard 2', lead350, the then closed switch 234, leads 35I and 325, first quarter-hourtrack. 3 I 3a of the clock, minute hand 3, hour hand 3I0, 8 p. m. hourtrack 3I2a whichrepresents the hour between 8 and 9 p. m.. lead 352, thethen closed 8 p. m. hour switch 213d on the switch board 2', lead 353,the then closed first contact pair 216a and b of the Wednesday switch onthe switch board 210, the then closed, third contact pair 304 of theWednesday section of the selector switch 300, and leads 354 and 328which pass to the other side of the input.

Reenergization of the electro-magnet 3l5 results in immediate movementof the contact blade 330 from engagement with contact 333 intoengagement with the contacts 33I and 332. Of course, as soon as thecontact blade 330 moves out of engagement with the contact 333, theabove-described energizing circuit for the quarter-hour drum-indexcontrolling electro-magnet I53 is opened, as will be readily understood.The reengagement of the contact blade 330 with the contact 33I, onenergization of the electro-magnet 3l5, again closes the previouslydescribed energizing circuit for the electro-magnet 258, re-

sulting in withdrawal of the stop finger I (Fig. 2'7) from the thenengaged stop pin 250 of the switch actuator 22I and permitting theindexing of the latter by the earlier described drive into the secondintermittent stopping position in which its lateral cam extension 244assumes the dotted line position 244a in Fig. 37. Again, the energizingcircuit for the electro-magnet 3I5 is opened while the switch actuatormoves through the last mentioned indexing step, as will be readilyunderstood.

In the second intermittent stopping position of the switch actuator 22I,the same closes the switches of the set 224 (see also Fig. 29). Closureof the switch 236 of this set results in closin I of the energizingcircuit for the elec-tro-magnet 2I3 which controls the power drive forthe condenser shaft 50. The energizing circuit for this electro-magnet2I3 comprises lead 320 with its connection with one side of the input,lead 365,

the winding of the electro-magnet 2I3, lead 366.-

the notch II5 of one of the station disks 5Ia--h aligns with the fingerII4 of the tuning element III which has beenraised by that arrester 90(Fig. 12) whose finger 92 has, at the end of the preceding drum indexingoperation, been dropped into a slot 61. Thus, when the finger II4 ofthis tuning element I I I springs into the aligned notch II5 of thestation disk, the condenser shaft is thereby locked against furtherrotation in an angular position commensurate with the accurately tuned,pre-selected station. The continued drive from the motor I38 into thefriction clutch element 20I becomes lost motion in the form of slippageof the clutch surface 203 of the shaft I34 on the'clutch surface 203 ofsaid clutch element 20I (Figs. 33 and 34). This slippage occurs,however, only momentarily as the tuning element III (Fig. 12), when itsfinger II4 springs into the notch II5 of the station disk, raises thedepresser frame I I8 sufiiciently to cause a finger. II8a thereon toclose a normally open switch 310 (Figs. 11 and 37), thereby againclosing the energizing circuit for the electromagnet 3l5 which nowcomprises lead 320 with its connection with one side of the input, lead32I, the winding of electro-magnet 3l5, leads 322 and 3', the thenclosed switch 310, lead 312, the then closed switch 231, and lead 328which passes to the other side of the input.

Thus, immediately after the finger II4 of the tuning element III dropsin the notch II5 of the pre-selected station disk, switch 310 is closedand electro-magnet 3l5 reenergized. The reenergized electro-magnet 3l5immediately attracts contact blade 330 and, hence, causes opening of theabove-described energizing circuit for the electro-magnet 2I3, with theresult that the stop finger 209 immediately returns into the path ofrotation of the stop pins 20% (Fig. 27) for nearest of said after theautomatic closing of the switch 310 causes also reenergization of theelectro-magnet 258 by virtue of the engagement of the contact blade 330with the contact 33I and the consequent closing of the previouslydescribed energizing circuit for said electro-m agnet 258.Reenergization of the electro-magnet 258 causes, on the other hand,withdrawal of the stop finger 25I from the then engaged stop pin 250 ofthe switch actuator 22I, thereby releasing the latter for the lastindexing step into home position in a manner well understood by now.

The holding circuit for the electric motor I38 is finally opened whenthe switch actuator 22I arrives in its home position and the gap 243 inthe annular track 242 thereof again bridges the switch 235 in the mannershown in Fig. 32a. This concludes an operating cycle of the automaticcontrol, and the same remains inoperative until the minute hand 3 of theclock contacts the second quarter-hour strip 3I3b thereof.

When this happens, and provided that the main control disc I62 has inthe meantime not been turned to the off position, the electromagnet 3l5is immediately reenergized, starting thereby another cycle of operationof the automatic control which includes this time only one quarter-hourindexing step of the control drum, however, as will be readilyunderstood. When the minute hand 3 of the clock mechanism assumes thedot-and-dash line position 3I Ia. in

' Fig. 37, the closed energizing circuit .for the electro-magnet 3l5 isas follows: lead 320 with its connection with one side of the input 3l8,lead 32L the winding of said electro-magnet SIB, leads I22 and 323, thethen normally closed contact pair "la and b of the second quarter-hourswitch 2"!) on the switchboard Ill, lead 3240, the then closed switch228, lead 325a, the second quarter-hour clock track 3l3b, the minutehand 3 in its dot and dash line position 3lia, the annular track 3, lead328, the then closed switch 225, and leads 321 and 328 which pass to theother side of the input. Thus, re-energization of the electro-magnet3l5, immediately after the minute hand 3H moves into contact with thesecond quarter-hour clock track 313b, starts a cycle of operation of theautomatic control which is the same as the previously described cycle ofoperation, with several exceptions to be noted presently.

As only a quarter hour has elapsed since the last cycle or operation, itis evident that the control drum is indexed only one fifteen minutestep. Furthermore, if the selected program extends over the secondquarter hour, the presently active tuning element III will only brieflyleave the notch H5 of its respective station disc (during the singleindexing step of the drum) and then be returned into registry with thenotch H5 of the same station disc when the follower 92 of the respectiveselector bar 80 drops into registry with the next, exposed notch 61 inthe control drum. It is, therefore, evident that the depressor frame H8is, at the end of said indexing step, again in the raised position inwhich its finger lBla closes the switch 370. Hence, the

switch 310 is already closed when the switch actuator 22l arrives in itssecond intermittent stopping position which is the tuning position. Thismeans that the electro-magnet M5 is immediately energized when theswitch actuator MI is in its second intermittent stopping position, withthe result that the energizing circuit for the electro-magnet 2i3'remains open and the gear disk I98 (Fig. 27) of the condenser shaftdrive is locked by the stop finger 209 through intermediation of atherewith engaged stop pin 2081) on the gear 208a. Furthermore,immediate energization of the electro-magnet 3l5 upon the closing ofswitch 231 by the lateral cam extension 2 of the switch actuator beforesaid cam extension arrives in the dotted line position 2440 (Fig. 37)results in closing of the energizing c-ircuit for the electro-magnet258, with the result that the stop finger 25l (Fig. 2'7) is withdrawnfrom the path of rotation of the nearest stop pin 250 on the switchactuator 22I when thr lateral cam extension thereof arrives in thedotted line position 2440. Under these circumstances, the switchactuator 22l then travels, without stopping, through the secondintermittent stopping position and returns immediately to home position.

If a program from another station is recorded on the drum for Wednesday,starting at 8:30 p. m., the next operating cycle of the automaticcontrol will again include a quarter hour indexing step of the controldrum and this time also a retuning cycle, requiring an intermittent stopof the switch actuator 22l in the second intermittent stopping position,as will be readily understood. Evidently, the retuning operation willthis time take place due to the fact that the last active arrester 90will, at the end of this indexing step of the drum, not meet an exposedslot 61 in the drum, with the result that the finger Ill of therespective tuning element ill will Ill not be returned into registrywith the aligned notch of the respective station disc, and no othertuning element may move into locking engagement with its station disc asits notch 15 out of alignment with the finger of said tuning element.This means that the depressed frame ll! is during the secondintermittent stop of the switch actuator sufliciently depressed so asnot to close the switch 310.

Hence, while the automatic control is turned on and after rendition ofthe first program to the expiration of the first quarter hour, theautomatic control goes through an operating cycle every fifteen minutesin order to index the control drum every time a quarter-hour stepregardless of whether the program or programs last fifteen minutes, onehalf hour or a whole hour. It the first program is a half hour programand the same is to be followed by a program from another station, itwill be readily understood that the operating cycle of the automaticcontrol at the expiration of the first half-hour program includes aretuning operation.

In the present instance, the automatic control is shown as beingapplicable between the hours of 5 o'clock and 10 oclock, but it is to bedistinctly understood that this is merely an example ofthe applicationof the invention as the same may be applied to cover any other hours ofthe day or night and also cover any other number of hours each day asthis would require merely self-evident changes in the construction ofthe present automatic control which would clearly not involve invention.

Suppose this were Wednesday and the automatic control has not beenturned on since Monday, it is then evident, that the Monday track lll'l,i. e., the one next to the innermost track ill! on the control drum,then closes the three contact pairs of the Monday switch on the dayswitchboard 210 in the same manner as the Wednesday switch is shownacted upon by the Wednesday track I01 on the drum in Fig. 37, meaningthat the two contact pairs of the Monday switch, which are shown closed,would be open and the contact pair shown open would be closed. If theselector disk IE2 is then turned into the on position and the switch I12thereby closed, the switch actuator 22! is immediately indexed from thehome position into its first intermittent stopping position in thepreviously described manner. However, when the switch actuator 22!reaches its first intermittent stoppingv position in which its lateralcam extension assumes the dot-and-dash line position Zflb (Fig. 3'7),the day drum-index mechanism B will come into operation until the drumhas been indexed to such an extent that its Wednesday track I01 actsupon the Wednesday switch on the day switchboard 210 in the manner shownin Fig. 37. This is due to the fact that it is now an electro-magnet 380which is energized, instead of the quarter-hour drum-index controllingelectro-magnet I53, when the switch actuator 22l is in the firstintermittent stopping position. The

energizing circuit for the electro-magnet 380 comprises the lead 320with its connection with one side of the input 3| 5, lead 381, thewinding of the electro-magnet 380, lead 382, the then manually closedsecond contact pair 303 of the Wednesday section of the selector switch300, lead 383, the then closed, second contact pair 217a and b of theWednesday switch on the switchboard 2l0,.and leads 354 and 328 whichpass to the other side of the input. The thus energized electro-magnet389 attracts the contact blade 358, thereby bringing the same intoengagement with a contact 385 and closing the energizing circuit for theday drum-indexcon- .trolling electro-magnet I3I, said circuit comprisingthe lead 320 with its connection with one side of the input, lead 386,the winding of the electro-magnet I3I, lead- 381, contact 385, contactblade 358, lead 359, the then closedswitch 230, leads 369 and 36I,contact 333, contact blade 338, and leads 338 and 339 which pass to theother side of the input. Energizationof the electro-magnet I3I causesimmediate rocking of the pawl I28 into cooperative relation with the dayindex pins I96 on the drum (see also'Fig. 1), and said pawl remains incooperative relation with the saidpins I until the control drum has beenindexed thereby to such an extent that its Wednesday track. I81 actsupon the Wednesday switch on the switchboard 216 in the manner shown inFig. 37. When this occurs, the abovedescribed energizing circuit for theelectro-mag-' net 388 is immediately opened as can be readily seen fromthe wiring diagram in Fig. 37, permitting the spring-urged contact blade358 to move into engagement with the contact 35'! and thereby close theenergizing circuit for" the quarter-hour drum-index controllingelectromagnet I53. Thereupon, the quarter-hour drumindexing mechanismwill perform its previously explained operation until the control drumassumes the angular position commensurate with the time indicated by thehour and minute hands 356 and 3| I, respectively, of the clock.

In the off position of the control disk- I62 shown in Fig. 18, the camlobe Ill thereon keeps the depresser frame I18, in its down position,with the result that none of the tuning elements I I I is in holdingengagement with a station disk and the receiver may be manually tuned.To this end, the condenser shaft 58 carries at one end a gear 480(Fig. 1) which is. in permanent mesh with a pinion MN on a shaft 402that preferably extends through the front panel of the receiver andcarries a knob (not shown) for manipulation of the condenser shaft 59through intermediation of shaft 492 and the gears MI and 466..

For conditioning the drum for preferred programs, it is advisable toproceed in the following manner. Supposing the operator wishes tocorresponding arrester 98 and, hence, depression of a filler 69 intoitsslot 61 by the finger 92 of said arrester and against the tendency ofthe corresponding spring-urged plunger 94 (Fig. 5) to retain said fillerin its slot-closing position. The operator thereupon returns the controldisk I62 td its off position, thereby swinging the rocker I13 from thefull-line into the dot-anddash line position in Fig. 21 and moving thebar 82 into filler-locking position. The other fillers 69 in the sameaxial row will also be depressed to some extent by their arresters 90,but not sumciently to become locked in slot-exposing position by the bar82 as their respective tuning elements III are prevented to move intolocking engagement with their respective station disks. The additionalmovement of the selected tuning element III from the periphery of itsstation disk into locking engagement therewith causes sufficientadditional depression of the selected filler that the bar 82 will lockthis filler in slotexposing position. To accomplish this with assurance,the tooth Tl between the two notches I5 and I6 of each filler is taperedin the manner best shown in Fig. 6.

Thus, the control drum is conditioned for the first quarter-hour of theselected broadcast. The operator'naturally performs the above-describedtask during each following quarter hour until the drum is conditionedfor the entire hour program. If the selected hour program is to befollowed by a half hour program from another station, for instance, theoperator conditions the drum for this latter program by manually tuningin said other station during the first quarter hour of the time theprogram is to be broadcast and then proceeds in exactly the same manneras above described, only this time for a half hour rendition. In thismanner, the control drum may be conditioned for rendition of any numberinterest may be readily replaced by others.

condition the drum for an hour program on a Wednesday or Wednesdays, hemanually tunes in on a Wednesday the station from which the broadcast tobe recorded originates within the first quarter of the hour during whichthe program will be broadcast. This will bring the notch II5 of theproper station disk Slat-h into alignment with the finger II4 of atuning element. The operator thereupon turns the control disc I62 intothe selector position shown in Fig. 19, thereby swinging the rocker I13from the dot-and-dash line position II3a into the full line positionshown in Fig. 21 and moving the therewith cooperating bar 82 out oflocking engagement with the fillers 69 of that axial row on the drumwhich is in alignment with the fingers 92 of the arresters 90. Theoperator then manipulates the condenser-shaft 58, through the previouslydescribed manual drive, slightly in both directions until the fingers II4 of the proper tuning element III springs into the aligned notch II5of the proper station'disk. This rocking movement of the tuning elementIII toward and into interlocking engagement with said station diskcauses clockwise rocking (Fig. 12) of the I claim:

an actuator therefor comprising a clock, a nor-- mally inoperativearrester for said member, a movable device carrying elements identifiedwith preassigned time periods for predetermined days of the week andbeing presettable to condition said arrester for action when alignedwith the latter, mechanism for moving said device, electrical meansassociated withsaid clock and including a manually operable day switchfor each of said days to cause operation of said mechanism until thepreset element corresponding to the clock time and the operated dayswitch aligns with the arrester, means locking saidmember to theconditioned arrester when the former is in a predetermined positiononly, a drive for said member, means becoming operative on .alignment ofsaid preset element with the arrester for rendering said driveoperative, and means rendering said drive inoperative on looking saidmember to the arrester.

2. The combination with a movable member, of an actuator thereforcomprising a clock, normally inoperative arresters adapted to arrestsaid member in different predetermined positions, respectively, amovable device carrying parallel series of transversely alignedelements, the rows of transversely aligned elements being identifiedwith preassigned time periods for predetermined days of the week andbeing presettable to condition said arresters, respec-

